Science

by Eric Barker

by TIME Video

by Jeffrey Kluger

by Jeffrey Kluger

by Melissa Hellmann

by Michael D. Lemonick

by TIME Photo

by Stephanie Burnett

by TIME Staff

by Michael D. Lemonick

by Sam Frizell

by Jonathan D. Woods

by TIME Staff

by Melissa Hellmann

by Alexandra Sifferlin and Bryan Walsh